FrozenDragon - I'm only using the Windows application, and the search works in that. It's weird that it doesn't work for you, too. Did you try selecting "all notes" before you do the search, so that you're searching all your records? Otherwise, Evernote applies the search to only the currently selected records and won't deliver complete results.
I wanted a search that would show me all records with either 1) undated reminders, or 2) dated reminders in which the reminder date is today or older. This search seems to deliver that: reminderOrder:* -reminderTime:day+1 Is this what everyone was looking for?